Ball-mill lining



- April 14, 1925.

R. H. BAKER 7 BALL MILL vLININGr Fild Jan. 31', 1925 Patented Apr. 14,1925.

UNITED STATES PATIENT OFFICE.

RAYMOND H. BAKER, OF NEW YORK, N. Y., ASSIGNOR T0 TAYLOR-WHARTON IRONAND STEEL COMPANY, OF HIGH BRIDGE, NEW JERSEY, A CORPORATION OF NEWJERSEY.

BALL-MILL LINING.

Application filed January 31, 1923. Serial No. 616,076.

To all whom it may concern:

Be it known that I, RAYMOND H. BAKER, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Ball-Mill Linings,of which the following is a specification.

The linings of grinding mills which utilize balls, pebbles and kindredfugitive grinding elements, are subject to rapid wear and mustbe renewedor replaced from time to time. lVith present linings this is more orless of an awkward proceeding entailing much time and labor.

Objects of my invention are to provide a lining of high efficiency; toprovide a lining of simple construction and which will outlast anylining heretofore proposed; to provide a lining which will remain tightunder all conditions of service; to provide a lining including main wearresisting elements in the form of rails; to provide a lining of thecharacter specified in which the rails, including head and base, aresolid and of considerable depth; to provide a lining of the characterspecified in which the base flanges of the rails co-operate withadjustable locking prhvisions; to provide a lining of the characterspecified in which the locking provisions are of such nature as toprovide for uniform spacing of the rails and eventual joint wear withthe rails; to provide a lining of the character specified in which theheads of the rails overhang the intermediate locking bar and temporarilyguard the same during the assemblage of the parts; to provide a liningof the character specified in which, after the heads of the rails areworn away, the remainder, consisting of rail bases and locking bars,will wear uniformly actually to the shell; and'to provide a rail linin'gsuch as indicated whereofthe rails are so formed and so co-related as toprovide trapping areas for trapping ore or other material undergoinggrinding which accordingly takes some of the wear and so prolongs thelife of thelining.

With such and other objects in view, the nature, characteristic featuresand scope of the invention will more readily be understood from thefollowing description beveled flanges of the rails.

taken in connection with the accompanying drawing, forming a parthereof, wherein, Figure l'is a fragmentary cross-sectional viegv of alining "embodying my invention; an

Fig. 2 is a perspective View of one of the rails and its complementallocking and spacing bar in detached relation.

According to my invention rails in steel, with a substantially largehead 5 and a broad bearing base 6. The tops of the rails are flat andpresent considerable surface area for grinding purposes. The sidesextend vertically a short distance and are then inwardly directed towhere they join the base. The latter has flanges 7 the side walls ofwhich are beveled as at 8.

(lo-operating with the rails for properly spacing and locking them arewedge elements consisting of plates or bars 9 with lateral bevels'10'corresponding to the The bars 9 have countersunk bolt holes 11 toaccommodate the locking bolts 12 which extend through the shell 13 andare secured by nuts 14;. Evidently, by tightening up on the nuts thewedge elements 9 will bear down upon the rail flanges and maintain theproper spacing and rigidity of the rails essential for efficientgrinding. The adjusting plates or elements 9 are substantially thethickness of the base flanges and when fully seated their tops are flushwith the tops of the flanges. It will be noted that the heads ofopposite rails overhang the plates 9 and this is of advantage in theassemblage of the parts in the temporary support of said plates.

The rails are so co-related with respect to their lateral shapes thatthe spaces between them afford means for trapping ore or other materialundergoing grinding which, without interfering with the adjusting means,

I becomes tightly packed or wedged between the rails and thus sharessome of the wear and so prolongs the life of the lining.

Since the rails are mates and the locking" bars are likewise mates, thelining is structurally simple and can be assembled with little loss oftime and labor.

paratively slowly and even when the heads are completely worn away thelining will still function for an appreciable period 0wing to the factthat the rail bases are solid or intact and will wear uniformly with thelocking bars all the way to the shell.

Having described my invention, I claim 1. In combination with the shellof a grinding mill, separable lining elements of substantial keystoneshape in cross section, the extended bases of which are arranged Therails being of considerable depth" and grinding surface area will wearcom-.

in contact with the shell, with the narrower portions of substantialdepth and thickness, and means cooperating with the edges of adjacentbases for securing said linings in place, said means having wedgingengage- ,rnent with such bases and presenting substantial. continuationsof such bases when the parts are assembled.

2. In combination with a shell of a grinding mill, longitudinallyarranged independent lining elements having broad bases with undercutwalls, and bars with edges to cooperate with and exert wedging action onsuch undercut walls, said bars being removably secured between adjacentlining elements, and forming practical continuation of such bases whenin securing relation to the shell. 7,

In testimony whereof I aflix my signature.

RAYMOND H. BAKER.

